Why are the main crankshaft journals in the Chevy Inlines (and lots of other GM cars of 1940's -50's) different sizes?
I see lots of other makes with the same diameter of standard crankshaft on all the mains.
Example: 1954 Chev Truck engine has 4 mains, (FM) 2.6855,(FI) 2.7155,(RI) 2.7465, (R) 2.7775
{each is about .031" bigger than the previous}
Anybody know why?
